Sony SLV-D300P (serv.man3) Service Manual ▷ View online
— 5 —
6) Product Safety Notice-Some electrical and mechanical parts have
special safety-related characteristics which are often not evident
from visual inspection, nor can the protection they give necessarily
be obtained by replacing them with components rated for higher
voltage, wattage, etc. Parts that have special safety characteristics
are identified by shading, an (
from visual inspection, nor can the protection they give necessarily
be obtained by replacing them with components rated for higher
voltage, wattage, etc. Parts that have special safety characteristics
are identified by shading, an (
) or a (
) on schematics and
parts lists. Use of a substitute replacement that does not have the
same safety characteristics as the recommended replacement part
might create shock, fire and/or other hazards. Product safety is
under review continuously and new instructions are issued
whenever appropriate.
same safety characteristics as the recommended replacement part
might create shock, fire and/or other hazards. Product safety is
under review continuously and new instructions are issued
whenever appropriate.
— 6 —
2 SERVICING PRECAUTIONS
CAUTION:
Before servicing units covered by this service manual
and its supplements, read and follow the Safety Precautions section of
this manual.
this manual.
Note:
If unforseen circument create conflict between the following
servicing precautions and any of the safety precautions, always follow
the safety precautions. Remember: Safety First.
the safety precautions. Remember: Safety First.
2-1 General Servicing Precautions
(1) a. Always unplug the instrument’s AC power cord from the AC
power source before (1) re-moving or reinstalling any
component, circuit board, module or any other instrument
assembly, (2) disconnecting any instrument electrical plug or
other electrical connection, (3) connecting a test substitute in
parallel with an electrolytic capacitor in the instrument.
component, circuit board, module or any other instrument
assembly, (2) disconnecting any instrument electrical plug or
other electrical connection, (3) connecting a test substitute in
parallel with an electrolytic capacitor in the instrument.
b. Do not defeat any plug/socket B+ voltage interlocks with which
instruments covered by this service manual might be equipped.
c. Do not apply AC power to this instrument and/or any of its
electrical assemblies unless all solid-state device heat sinks are
correctly installed.
correctly installed.
d. Always connect a test instrument’s ground lead to the instrument
chassis ground before connecting the test instrument positive
lead. Always remove the test instrument ground lead last.
lead. Always remove the test instrument ground lead last.
Note:
Refer to the Safety Precautions section ground lead last.
(2) The service precautions are indicated or printed on the cabinet,
chassis or components. When servicing, follow the printed or
indicated service precautions and service materials.
indicated service precautions and service materials.
(3) The components used in the unit have a specified flame resistance
and dielectric strength.
When replacing components, use components which have the same
ratings. Components identified by shading, by (
When replacing components, use components which have the same
ratings. Components identified by shading, by (
) or by (
) in
the circuit diagram are important for safety or for the characteristics
of the unit. Always replace them with the exact replacement
components.
of the unit. Always replace them with the exact replacement
components.
(4) An insulation tube or tape is sometimes used and some components
are raised above the printed wiring board for safety. The internal
wiring is sometimes clamped to prevent contact with heating
components. Install such elements as they were.
wiring is sometimes clamped to prevent contact with heating
components. Install such elements as they were.
(5) After servicing, always check that the removed screws,
components, and wiring have been installed correctly and that the
portion around the serviced part has not been damaged and so on.
Further, check the insulation between the blades of the attachment
plug and accessible conductive parts.
portion around the serviced part has not been damaged and so on.
Further, check the insulation between the blades of the attachment
plug and accessible conductive parts.
2-2 Insulation Checking Procedure
Disconnect the attachment plug from the AC outlet and turn the power
ON. Connect the insulation resistance meter (500V) to the blades of
the attachment plug. The insulation resistance between each blade of
the attachment plug and accessible conductive parts (see note) should
be more than 1 Megohm.
ON. Connect the insulation resistance meter (500V) to the blades of
the attachment plug. The insulation resistance between each blade of
the attachment plug and accessible conductive parts (see note) should
be more than 1 Megohm.
Note:
Accessible conductive parts include metal panels, input
terminals, earphone jacks, etc.
— 7 —
3 ESD PRECAUSIONS
Electrostatically Sensitive Devices (ESD)
Some semiconductor (solid state) devices can be damaged easily by
static electricity.
Such components commonly are called Electrostatically Sensitive
Devices (ESD). Examples of typical ESD devices are integrated circuits
and some field-effect transistors and semiconductor chip components.
The following techniques should be used to help reduce the incidence
of component damage caused by static electricity.
static electricity.
Such components commonly are called Electrostatically Sensitive
Devices (ESD). Examples of typical ESD devices are integrated circuits
and some field-effect transistors and semiconductor chip components.
The following techniques should be used to help reduce the incidence
of component damage caused by static electricity.
(1) Immediately before handling any semiconductor component or
semiconductor-equipped assembly, drain off any electrostatic
charge on your body by touching a known earth ground.
Alternatively, obtain and wear a commercially available
discharging wrist strap device, which should be removed for
potential shock reasons prior to applying power to the unit under
test.
charge on your body by touching a known earth ground.
Alternatively, obtain and wear a commercially available
discharging wrist strap device, which should be removed for
potential shock reasons prior to applying power to the unit under
test.
(2) After removing an electrical assembly equipped with ESD devices,
place the assembly on a conductive surface such as aluminum foil,
to prevent electrostatic charge buildup or exposure of the assembly.
to prevent electrostatic charge buildup or exposure of the assembly.
(3) Use only a grounded-tip soldering iron to solder or unsolder ESD
devices.
(4) Use only an anti-static solder removal devices. Some solder
removal devices not classified as “anti-static” can generate
electrical charges sufficient to damage ESD devices.
electrical charges sufficient to damage ESD devices.
(5) Do not use freon-propelled chemicals. These can generate electrical
charges sufficient to damage ESD devices.
(6) Do not remove a replacement ESD device from its protective
package until immediately before your are ready to install it. (Most
replacement ESD devices are packaged with leads electrically
shorted together by conductive foam, aluminum foil or comparable
conductive materials).
replacement ESD devices are packaged with leads electrically
shorted together by conductive foam, aluminum foil or comparable
conductive materials).
(7) Immediately before removing the protective materials from the
leads of a replacement ESD device, touch the protective material
to the chassis or circuit assembly into which the device will be
installed.
to the chassis or circuit assembly into which the device will be
installed.
CAUTION:
Be sure no power is applied to the chassis or circuit, and
observe all other safety precautions.
(8) Minimize bodily motions when handling unpackaged replacement
ESD devices. (Otherwise harmless motion such as the brushing
together of your clothes fabric or the lifting of your foot from a
carpeted floor can generate static electricity sufficient to damage
an ESD device).
together of your clothes fabric or the lifting of your foot from a
carpeted floor can generate static electricity sufficient to damage
an ESD device).
— 8 —
4 HANDLING THE OPTICAL PICK-UP
The laser diode in the optical pick up may suffer electrostatic
breakdown because of potential static electricity from clothing and
your body.
breakdown because of potential static electricity from clothing and
your body.
The following method is recommended.
(1) Place a conductive sheet on the work bench (The black sheet used
(1) Place a conductive sheet on the work bench (The black sheet used
for wrapping repair parts.)
(2) Place the set on the conductive sheet so that the chassis is grounded
to the sheet.
(3) Place your hands on the conductive sheet(This gives them the same
ground as the sheet.)
(4) Remove the optical pick up block
(5) Perform work on top of the conductive sheet. Be careful not to let
your clothes or any other static sources to touch the unit.
◆ Be sure to put on a wrist strap grounded to the sheet.
◆ Be sure to lay a conductive sheet made of copper etc. Which is
◆ Be sure to lay a conductive sheet made of copper etc. Which is
grounded to the table.
Fig.3
(6) Short the short terminal on the PCB, which is inside the Pick-Up
ASS’Y, before replacing the Pick-Up. (The short terminal is shorted
when the Pick-Up Ass’y is being lifted or moved.)
when the Pick-Up Ass’y is being lifted or moved.)
(7) After replacing the Pick-up, open the short terminal on the PCB.
THE UNIT
WRIST-STRAP
FOR GROUNDING
FOR GROUNDING
1M
1M
CONDUCTIVE SHEET
Click on the first or last page to see other SLV-D300P (serv.man3) service manuals if exist.